Web carrier for paper-making machines



Dec. 6, 1927.

W. E. SHEEHAN WEB CARRIER FOR PAPER MAKING MACHINES Fild Dec. 17, 1925WEB FORMER IN V EN TOR.

Patented Dec. 6, 1927.

PATENT OFFICE.

WILLIAM E. SHEEHAN, OI ALBANY, NEW YORK.

WEB CARRIER FOR PAPER-MAKING MACHINES.

Application filed December 17, 1925. Serial No. 76,071.

My present invention relates to paper- .making machines, particularly tothe webcarrying means employed on such machines at a numberof points,and which form a part of the means used to convey or carry the wet webof paper from the web-forming device to and through the couch and pressrolls, and then'to the dryers.

The object of this invention is to provide a wet-web carrier which willbe stronger, and will wear and give satisfactory results for a muchgreater eriod of time than will the usual paper-ma ers felts adapted forthe same service and which are made from woven wool yarns; and whichwill be less expensive to use than are, and may be substituted for thepresent usual felts.

This present invention is in line with, and is an improvement over theweb-carriers disclosed in United States Patent No. 1,536,533 issued tome under date of May 5, 1925; and the endless felt disclosed in UnitedStates Patent No. 1,062,877, and which was issued to Arthur H. Beganiand myself under date of May 27, 1913.

The manner in which I accomplish my object is illustrated in theaccompanying drawings, in which:

Fig. 1 is a diagram illustrating the strue- 5:0 ture of my improvedweb-carriers; Fig. 2

is a similar diagram illustrating the structure of my improvedweb-carrier when it is to be used in place of a usual drainage felt; andFig. 3 is a diagram of a typical paper- :m making machine andillustrates uses for which my improved carriers are adapted.

Referring to Figs. 1 and 9. of the drawings, B represents an endlesswoven fabric base made from cotton, jute, or other suit- 40 ablevegetable fiber yarns. This belt or base may be rubberized as is thereinforced base referred to in the prior patent to me before mentioned,if so desired. F represents a covering sheet or layer of wool, eithercarded wool, wool pounded into a felt, or wool spun and made into afabric. The working face of this covering sheet, the exposed face, is tobe smooth and to be given the particular finish required for the work itis intended.

The base B, and the covering sheet or face F, are secured together bymeans of a suitable elastic adhesive C. This adhesive is to be a rubbercement or some other suitable adhesive which is insoluble by Water.

' Web-carriers which are to be used in place carry the web of paper itis desirable to have them airtight. When making my improved carriers I,therefore, distribute the adhesive material in more than one manner.

If the carrieris to be used as a pick-up felt the adhesive is laid oniina continuous sheet, as illustrated in Fig. 1, while if the carrier is tobe used as a drainage felt the adhesive is laid on in such a manner thatit is porous instead of continuous, and the base on which it is laid ispreferably of'a coarser weave; a carrier adapted for use as a drainagefelt is illustrated by Fig. 2. In 3 I have indicated two uses for whichmy improved web-carriers are adapted. In the figure PC represents acarrier the structure of which is that illustrated in Fig. 1, whereinthe adhesive is a continuous sheet which prevents the passage of airthrough the carrier, as well as securing together the base and faceparts. The carrier is here used as a pick-up felt.

In this same figure 3) DC represents a web-carrier the structure ofwhich is that illustrated in Fig. 2, wherein the adhesive is notcontinuous, it being here used in place of the usual drainage felt whichis used "to carry the web of paper while it is in a very moist state,and which preferably is of high porosity.

By using an endless belt of woven vegetable fibers as the base or mainstrain supporting. member of my improved carriers, and securing to oneside thereof a properly finished homogeneous sheet of wool, by means ofa suitable adhesive laid therebetween, I am able to produce aweb-carrier which is exceptionally strong and will withv stand for anunusually long period of time, without stretching out of shape, thestrains to which it is' subjected while in service.

By using vegetable fibers in the production of the base or endless belt,I secure an unusual strength at a comparatively lower cost; and bysecuring thereto a homogeneous sheet of wool to form the working face,and in a manner which is simple, inexpensive, and efficient, I amenabled to make use of comparatively inexpensive short wool in producingsaid Working face. While I may use any of the before mentioned styles ofhomogeneous sheets of wool for the working face of my improved carriers,I now prefer to use what is known as a pounded felt as such a facingwill wear much longer than will the working face of any present type ofpaper-makers felt and it cannot possibly cause yarn marks on the web ofpaper.

The use of the elastic adhesive for join- 7 ing together the base andface portions of homo eneous sheet of wool secured to one side t ereofby means of an elastic adhesive.

2. In a aper-making machine in combination wit the usual Web-formingdevice, couch rolls, and press rolls: means for conveying a wet web ofpaper from the webforming device to and through the press rolls, and toa dryer, said means including an endless belt of woven vegetable fibers,to one side whereof is secured by means of an elastic adhesive, ahomogeneous sheet of wool adapted to engage the wet web of paper.

3.-In a paper-making machine, in combination with the usual web-formingdevice, couch rolls, and press rolls: means for conveying the wet web ofpaper from the webforming device to and through the press rolls, saidmeans including a web carrier comprising anendless belt of coarselywoven vegetable fibers, and secured to one side thereof by means of asuitable adhesive,

such as rubber cement, which is insoluble by water, a homogeneous sheetof wool the exposed side whereof is smooth and forms the work engagingsurface-of the'carrier.

4. A web-carrier for use on a'paper-making machine, said carriercomprising an endless belt of woven vegetable fibers, and secured tosaid belt by means of an elastic adhesive, such as a rubber cement, ahomogeneous sheet of wool.

5. A web-carrier for use on a paper-making machine, said carriercomprising an endless belt of woven vegetable fibers, to which there issecured, by means of an elastic adhesive, such as rubber cement, a homoeneous sheet of wool the exposed surface w ereof is smooth and forms thework engaging face of the carrier.

6. A web-carrier for use on paper-making machines, and comprising anendless belt of woven vegetable fibers, to one face whereof is securedby means of a layer of elastic adhesive material, such as rubber cement,a sheet of pounded felt the exposed side whereof is smooth and forms thework engaging face of the carrier.

7. A web-carrier for use on a paper-mark ing machine, and comprising anendless belt of woven vegetable fibers, to one face whereof is securedby meansof a erforated layer of elastic adhesive materia such as rubbercement, a homogeneous sheet of wool.

In testimony whereof I have afiixed my signature.

WILLIAM E. SHEEHAN.

